Water-tube boiler.



No. 845,386. v PATENTED PEB. 26, 1907.

J. WILDMAN.

WATER TUBE BOILER.

APPLIOATION FILED APP.23. 1906.

nl: Nonni; Eriks ca, wAsulNcTON. n c.

PATENTED PEB.26, 1907.

J. WILDMAN. y

WATER TUBE BOILER.`

APPLIOATION I'I'LEDv APR. 23, 1906.

` ZSHBBTS-SHBBT 2.

Q O G O Q Q Q Q TNI Kanus rlrxn w.. 'Alamein'. s. c.

JAMES WILDMAN, OF CHICAGO, ILLINOIS.

WATER-TUBE BOILER.

Specification. of Letters. Patent.,

Patented Feb..26, 1907.`

Application led April 23, 1906.' Serial lle. 313,120

To ncl/l '1u/wm, t may concern:

Be it known that. I, JAMES WILDMAN, a resident of Chicago, in thevcounty of Cook and State of Illinois, have invented certain new anduseful Improvements in a Combined F ire-Tube and Vater-TubeBoler, ofwhich the following is a full, clear', and exactdescription.

My invention relates to certain new and useful improvements in combinedhre-tube and water-tube boilers; and its object is to provide means forincreasing the heating surface. presented to the firewithoutendangering'a boiler of thisparticular typeV to injury.

Another object is to providek means for compensating theunequalexpansion of the various parts of the'boiler and utilizing such means tofurther increase the heating-surface.

Another'object is to afford rapid circulation between the. fire-,tubeportion. of'the boiler and the water-tube-portion.

Another object is to increase its efliciency and to construct andarrange the parts so as to avoid the possibility of the tearing out Vofthe water-tubes vfrom the parts to which they are connected.

To such end the invention consists inV certain novel features ofconstruction and arrangement, a description of which will' be found inthe following specification with the `essential features thereof moreydefinitely pointed out in the claims appended thereto. rThe inventionis clearly illustrated in the drawings presented herewith, in whichFigure 1 is a view, partly in side elevation and partly in verticallongitudinal section, illustratinga boiler embodying my invention. F ig.2 is a vertical cross-section taken in the line 2 2 of Fig. 1. Fig. 3 isa horizontal section taken in the line 3 3 of Fig. 1 and looking upward,and Fig. 4 is a vertical cross-section taken in the line 4 4 of Fig. 1.

In these views l0 is a lire-tube boiler of ordinary construction, whichmay be provided with the ordinary steam-dome 11, if desired, and isprovided at its forward end with a smoke-stack 12. Vithin the boiler arethe fire-tubes 13, which are secured in the heads of the boiler in theusual manner. The boiler is provided at its forward end with awater-front 14, which extends downward therefrom and communicatestherewith through a series ofperforations 15,formed in the wall of theboiler. I prefer to perforate the boiler at this point instead of makinga large single opening, so as to avoid weakening the b oilerr at thispoint, which is obviously an important feature in devices of this kind:This water-front is provided with the usual doors. 17, and back of thesame is a bridge-wall 21. Between them are supported thcgrate-bars 22.The rear wall of th'edevice is made up of two stationary portions 23 24and a movable portion 3. The:` portion 23 is preferably constructed of"bricks and the portion 24 preferably made up of curved angle-irons 25,secured toy the rear head of the boiler 10, having supported TheVremainder of thef rear wall is in the form of a water-back for' theboiler, and this water-back is providedY thereupon bricks 26'.

upon itsupper'and lower endswith bearingplates 31 32 and isslidablymounted between' thel upper and lower portions 23 24y of the-rThe water-front 14y and water-back 3 arevk connected by water-tubes 4,which are located in the direct path of the-Haine, and toV provide rapidcirculation the main boiler 10 and water-back 3 are connected bycirculant-- ing-pipes 5 and 6. Each of` thel two circulating-pipesconsists of two' segments orv members 61 and 62, extending at anangleftoV each other and connected by elbows'63, so as to permit of alimited amount of play be'-y tween their ends which enter the boiler andwater-back, respectively. The usual handholes 16 and 35 are providedandthe parts arebraced and stayed in the manner'well known to thoseyskilled in the art of boilermaking..

The advantages of a combined fire-tube and water-tube boiler are wellknown; but great difficulty has been encountered on account of theunequal expansion of the retubes and water-tubes. The water-tubes, lyingimmediately above the fire, are subjected to the hottest part of thefiames and contain a very small body of water, while the fire-tubes arefarther removed from the re and are surrounded by a great body of water.It is for this reason that the water-tubes when connected to heads orother water-legs outside of and rigidly secured to the main IUO IOS

IIC

boiler are apt to bend out of shape or tear l in the rear setting wallto slide between roliloose from their supports. In fact, it irequentlyhappens that the tubes themselves are split open, and the fireman is aptto be severely injured from the escaping steam. To avoid thesedifficulties, I have dispensed with the usual water-leg on the rear endof the boiler and provided a suitably-supported andlongitudinally-movable water-back with which the water-tubes areconnected, which waterbacl is extended up to form practically the entirerear wall oi' the device. The waterback being unprovided with any rigidconnections with the boiler other than the watertubes is free to movelongitudinally whenever any such movement is necessitated through theexpansion and contraction of the water-tubes, whereas it' it wererigidly connected to the boiler or to any other stationary part it wouldbe compelled to rock upon such stationary part, and the same danger tothe oints would again be present. It will be obvious that the 'flamespassing between the water-tubes strike the bottom of the main boiler andare then deflected by the baffle, so as to again pass between thewatertubes and up along the rear wall or waterbaclt and then out throughthe fire-tubes of the main boiler and up the smoke-stack. In this waypractically all of the heat units are utilized to advantage. `Where theordinary brick wall is used at the rear oi the furnace, much of the heatfrom the flame is absorbed in the wall and lost, whereas with myimproved device all these heat units are made use oi. Tere thiswater-back rigid, however, the water-tubes would be in danger ofbuckling or tearing loose, whereas inasmuch as it is movable theexpansion and contraction of the water-tubes is made possible withoutany danger whatever.

I realize that various alterations and inodiications of thisconstruction are possible, and I do not, therefore, intend to limitmyself to the specific construction shown and described.

I claim as new and desire to secure by Iletters Patent- 1. Thecombination with a tire-tube boiler having at'its front end a dependentwaterfront, of a water-back at some distance in the rear of the rear endof the boiler and mounted ers above and below, water-tubes connectingsaid water-iront to the lower part of said water-back, and tubes forminga horizontally-yielding connection between the upper portion of thewater-back and the boiler.

2. The combination with a fire-tube boiler having a dependentwater-front, of a wall at some distance in the rear of' the rear end ofthe boiler, extending forward to meet the boiler above the iire-tubestherein and provided with a way for a water-back, a waterbaclr mountedin said way to move in a front to rear direction upon rollers in saidway, water-tubes connecting said water-front with the lower part of saidwater-back, and tubes connecting the upper part of the water-back withthe boiler and arranged to readily permit horizontal movements of thewater-back.

3. The combination with a iireftube boiler having at its front end astack and a dependent water-front forming the front wall of acoinbustion-chamber, a detached water-back at some distance in the rearof the rear end of the boiler, mounted to slide back and forth in afront to rear direction and forming a dei'lector Jfor the products ofcombustion, watertubes connecting the water-front and waterback, andpipes forming a horizontally-yielding connection between the water-backand the boiler.

4. The combination with a boiler having at its front end a stack and adependent water-front, of a detached vertical waterbacl mounted in awall at some distance in the rear of the boiler to slide freely towardand from the latter, dowinvardly-inclined water- 'tubes connecting thewater-front to the lower part of the water-back, de'tlecting-wallsbetween the planes of the water-front and water-back to throw theproducts of combustion aiternately upward and downward past thewater-tubes, and tubes connecting the upper portion of the water-back tothe boiler and arranged to permit iree horizontal movement of thewater-back, substantially as set Jforth.

JAMES WILDMAN.

Vitnesses STEPHEN H. JONES, .THEODORE DILKs.

